How to sum array value of duplicate data

Question

I have an array with some of same ID value as shown in below.

[
    {\"ID\":\"126871\",\"total\":\"200.00\",\"currency\":\"USD\",\"name\":\"John         


        

Answer 1

You will need to:

• Convert your json string to a php array with json_decode.
• Loop through the rows and group them using compound temporary keys. In other words generate a single string from each row's ID & currency values and use that string as the temporary unique key.
• Sum the grouped row's total values.
• Then prepare the output array for its return to json by reindexing the rows and calling json_encode().

Code: (Demo)

$json='[
    {"ID":"126871","total":"200.00","currency":"USD","name":"John"},
    {"ID":"126872","total":"2000.00","currency":"Euro","name":"John"},
    {"ID":"126872","total":"1000.00","currency":"Euro","name":"John"},
    {"ID":"126872","total":"500.00","currency":"USD","name":"John"},
    {"ID":"126872","total":"1000.00","currency":"Euro","name":"John"}
]';

$array=json_decode($json,true);  // convert to array
foreach($array as $row){
    if(!isset($result[$row['ID'].$row['currency']])){
        $result[$row['ID'].$row['currency']]=$row;  // on first occurrence, store the full row
    }else{
        $result[$row['ID'].$row['currency']]['total']+=$row['total'];  // after first occurrence, add current total to stored total
    }
}
$result=json_encode(array_values($result));  // reindex the array and convert to json
echo $result;  // display

Output:

[
    {"ID":"126871","total":"200.00","currency":"USD","name":"John"},
    {"ID":"126872","total":4000,"currency":"Euro","name":"John"},
    {"ID":"126872","total":"500.00","currency":"USD","name":"John"}
]

Answer 2

@Cloud I have made function for your requirement and Thanks @M. I. for look into this sum section.

$array = array(
    array("ID"  => "126871","total"=>"200.00","currency"=>"USD","name"=>"John"),
    array("ID"  => "126872","total"=>"2000.00","currency"=>"Euro","name"=>"John"),
    array("ID"  => "126872","total"=>"1000.00","currency"=>"Euro","name"=>"John"),
    array("ID"  => "126872","total"=>"500.00","currency"=>"USD","name"=>"John"),
    array("ID"  => "126872","total"=>"1000.00","currency"=>"Euro","name"=>"John"),
);
echo "<pre>";
print_r($array);

function unique_multidim_array($array, $key,$key1,$addedKey) { 
    $temp_array = array(); 
    $i = 0; 
    $key_array = array(); 
    $key1_array = array(); 

    foreach($array as $val) { 
        if (!in_array($val[$key], $key_array) && !in_array($val[$key1], $key1_array)) { 
            $key_array[$i] = $val[$key]; 
            $key1_array[$i] = $val[$key1]; 
            $temp_array[$i] = $val; 
        }else{
            $pkey = array_search($val[$key],$key_array);
            $pkey1 = array_search($val[$key1],$key1_array);
            if($pkey==$pkey1){
                $temp_array[$pkey][$addedKey] += $val[$addedKey];
            }else{
                $key_array[$i] = $val[$key]; 
                $key1_array[$i] = $val[$key1]; 
                $temp_array[$i] = $val; 
            }
            // die;
        }
        $i++; 
    } 
    return $temp_array; 
} 

$nArray = unique_multidim_array($array,"ID","currency","total");
// die;
print_r($nArray);
die;